DD1 is 12 and has a smartphone, but not a cool one.
No phones at the table.
All phones charged in the kitchen overnight and not taken up to bedrooms.
Keep it safe at school - don't wave it about - obey school rules (i.e. silent during lessons).
We are "allowed" to look at it, and will do so from time to time.
If you need internet, engage your brain about how to access it (i.e. use wifi in the house - preferably on the PC, where you can actually see the screen)
No social networking (she's not interested anyway, thankfully)
Haven't used removal of phone as a threat so far, because she's not really that bothered by it. But its on a contract, in DH's name, so if there was an issue we wouldn't hesitate to ban it for a while.